Commit a3320d7f authored by Paul Asmuth's avatar Paul Asmuth
Browse files

improved legend layouting code

parent 59768497

elements/legend.cc

+120 −26
Original line number Diff line number Diff line
@@ -38,7 +38,7 @@ namespace plotfx { 


static const double kDefaultLabelFontSizeEM = 1;

static const double kDefaultPaddingHorizEM = 2.4;

static const double kDefaultPaddingVertEM = 1.2;

static const double kDefaultPaddingVertEM = 1.6;

static const double kDefaultItemPaddingHorizEM = 2.4;

static const double kDefaultItemPaddingVertEM = 1.0;
@@ -57,6 +57,67 @@ void LegendConfig::addEntry( 
  entries.emplace_back(std::move(item));

}



ReturnCode legend_layout(

    const LegendConfig& legend,

    Point origin,

    std::function<ReturnCode (size_t idx, Point p)> on_label,

    const Layer* layer,

    Rectangle* bbox) {

  auto font_size = from_em(kDefaultLabelFontSizeEM, layer->font_size);

  auto padding_item_right = measure_or(

      legend.item_margins[1],

      from_em(kDefaultItemPaddingHorizEM, font_size));



  double point_size = 5; // FIXME

  double line_height = font_size; // FIXME



  double sx = origin.x;

  double sy = origin.y;



  for (size_t idx = 0; idx < legend.entries.size(); ++idx) {

    const auto& e = legend.entries[idx];

    const auto& label_text = e.title;



    if (on_label) {

      if (auto rc = on_label(idx, Point(sx, sy + line_height / 2)); !rc) {

        return rc;

      }

    }



    TextStyle style;

    style.font = legend.font;

    style.font_size = font_size;



    Rectangle label_bbox;

    auto rc = text::text_measure_span(

        label_text,

        style.font,

        style.font_size,

        layer->dpi,

        layer->text_shaper.get(),

        &label_bbox);



    if (rc != OK) {

      return rc;

    }



    sx += point_size * 2.8; // FIXME

    sx += label_bbox.w;



    if (idx + 1< legend.entries.size()) {

      sx += padding_item_right;

    }

  }



  sy += line_height;



  if (bbox) {

    *bbox = Rectangle(origin.x, origin.y, sx - origin.x, sy - origin.y);

  }



  return OK;

}



ReturnCode legend_draw_inside(

    const LegendConfig& legend,

    const Rectangle& bbox,
@@ -67,6 +128,10 @@ ReturnCode legend_draw_inside( 
      legend.margins[3],

      from_em(kDefaultPaddingHorizEM, font_size));



  double padding_right = measure_or(

      legend.margins[1],

      from_em(kDefaultPaddingHorizEM, font_size));



  double padding_top = measure_or(

      legend.margins[0],

      from_em(kDefaultPaddingVertEM, font_size));
@@ -81,35 +146,59 @@ ReturnCode legend_draw_inside( 


  double point_size = 5; // FIXME



  double sx = bbox.x + padding_left;

  double sy = 0;

  double line_height;

  Rectangle content_bbox;

  if (auto rc = legend_layout(

      legend,

      Point(0, 0),

      nullptr,

      layer,

      &content_bbox);

      !rc) {

    return rc;

  }



  Point origin(0, 0);



  switch (legend.position_horiz) {

    case HAlign::LEFT:

      origin.x = std::min(

          bbox.x + padding_left,

          bbox.x + bbox.w);

      break;

    case HAlign::RIGHT:

      origin.x = std::max(

          bbox.x + bbox.w - content_bbox.w - padding_right,

          bbox.x);

      break;

    case HAlign::CENTER:

      origin.x = bbox.x + bbox.w / 2 - content_bbox.w / 2;

      break;

  }



  switch (legend.position_vert) {

    case VAlign::TOP:

      line_height = font_size; // FIXME

      sy = bbox.y + padding_top + line_height / 2;

      origin.y = bbox.y + padding_top;

      break;

    case VAlign::BOTTOM:

      line_height = -font_size; // FIXME

      sy = bbox.y + bbox.h - padding_bottom + line_height / 2;

      origin.y = bbox.y + bbox.h - content_bbox.h - padding_bottom;

      break;

    case VAlign::CENTER:

      line_height = font_size; // FIXME

      sy = bbox.y + bbox.h / 2;

      origin.y = bbox.y + bbox.h / 2;

      break;

  }



  for (const auto& e : legend.entries) {

  auto draw_label = [&] (size_t idx, Point pos) {

    const auto& e = legend.entries[idx];

    const auto& label_text = e.title;



    {

      FillStyle style;

      style.color = e.color;

      Path path;

      path.moveTo(sx + point_size, sy);

      path.arcTo(sx, sy, point_size, 0, M_PI * 2);

      path.moveTo(pos.x + point_size + point_size / 2, pos.y);

      path.arcTo(pos.x + point_size / 2, pos.y, point_size, 0, M_PI * 2);

      fillPath(layer, path, style);

      sx += point_size * 2.4;

      pos.x += point_size * 2.8; // FIXME

    }



    {
@@ -118,27 +207,28 @@ ReturnCode legend_draw_inside( 
      style.font = legend.font;

      style.font_size = font_size;



      Rectangle label_bbox;

      auto rc = text::text_measure_span(

          label_text,

          style.font,

          style.font_size,

          layer->dpi,

          layer->text_shaper.get(),

          &label_bbox);



      if (auto rc = drawTextLabel(

            label_text,

            Point(sx, sy),

            pos,

            HAlign::LEFT,

            VAlign::CENTER,

            style,

            layer); rc != OK) {

        return rc;

      }



      sx += label_bbox.w + padding_item_right;

    }



    return OK;

  };



  if (auto rc = legend_layout(

      legend,

      origin,

      draw_label,

      layer,

      nullptr);

      !rc) {

    return rc;

  }



  return OK;
@@ -184,21 +274,25 @@ ReturnCode legend_configure_position( 


    if (prop == "top") {

      *position_vert = VAlign::TOP;

      position_vert_set = true;

      continue;

    }



    if (prop == "bottom") {

      *position_vert = VAlign::BOTTOM;

      position_vert_set = true;

      continue;

    }



    if (prop == "left") {

      *position_horiz = HAlign::LEFT;

      position_horiz_set = true;

      continue;

    }



    if (prop == "right") {

      *position_horiz = HAlign::RIGHT;

      position_horiz_set = true;

      continue;

    }

tests/legend/test_legend_inside_bottom_center.plot

0 → 100644
+19 −0
Original line number Diff line number Diff line 
width: 1200px;

height: 480px;



plot {

  legend: inside bottom center;

  legend-title: "The quick brown fox";



  series {

    title: "Series 1";

    xs: csv('tests/testdata/measurement.csv', 0);

    ys: csv('tests/testdata/measurement.csv', 2);

  }



  series {

    title: "Series 2";

    xs: csv('tests/testdata/measurement.csv', 0);

    ys: csv('tests/testdata/measurement.csv', 4);

  }

}

tests/legend/test_legend_inside_bottom_center.svg

0 → 100644
+76 −0
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tests/legend/test_legend_inside_bottom_left.plot

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width: 1200px;

height: 480px;



plot {

  legend: inside bottom left;

  legend-title: "The quick brown fox";



  series {

    title: "Series 1";

    xs: csv('tests/testdata/measurement.csv', 0);

    ys: csv('tests/testdata/measurement.csv', 2);

  }



  series {

    title: "Series 2";

    xs: csv('tests/testdata/measurement.csv', 0);

    ys: csv('tests/testdata/measurement.csv', 4);

  }

}

tests/legend/test_legend_inside_bottom_left.svg

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